The Sieg (German pronunciation: [ziːk] ⓘ) is a river in North Rhine-Westphalia and Rhineland-Palatinate, Germany.

Further west the Sieg valley forms the boundary of the Bergisches Land (northern) and Westerwald (southern).

The river finally runs through a protected area east of the city of Bonn.

After passing the cities of Hennef and Siegburg, the river flows into the Rhine at the Naturschutzgebiet Siegaue, a protected area immediately to the northeast of the city of Bonn, near Niederkassel/Mondorf [de; ro].

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